The owner of the Golden Mardi Gras, Golden Gulch and Golden Gates casinos in Black Hawk said Friday a cyberattack on the company’s computer systems has compromised the credit-card and debit-card information of its patrons.

Las Vegas-based Affinity Gaming urged gamblers who visited any of the company’s 11 properties nationwide between March 14 and Oct. 16 to check their credit-card statements for suspicious activity. Affinity attorney Jim Prendergast estimates that fewer than 300,000 cardholders may have been affected, according to a report by The Associated Press.

The company issued the following statement on its website:

“Affinity Gaming recently became aware of an intrusion into the system that processes customer credit and debit cards for our casinos, and a thorough investigation is underway by third-party data forensics experts. We also have notified law enforcement and gaming regulatory officials, and are cooperating in investigating the matter. Although our forensics investigation is ongoing, outside experts have confirmed that our system has been fully secured and our customers’ payments are protected. Once the investigation is concluded, we will provide more information.”

Affinity acquired the three Black Hawk casinos in 2012 from Golden Gaming.

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